Basic usage

Example #1 Output Control example

<?php

ob_start();echo "Hello\n";

setcookie("cookiename", "cookiedata");

ob_end_flush();

?>

In the above example, the output from echo
would be stored in the output buffer until
ob_end_flush() was called. In the mean time,
the call to setcookie() successfully stored a
cookie without causing an error. (Headers cannot normally be sent
to the browser after data has already been sent.)